It would be great if our community of Ruby hackers could read this spec and supply feedback via their comment system. Remember that classes and methods that aren't included may not be present across implementations.

A few omissions that jumped out just from my quick scan:

- String.index & String.rindex - String.strip - Array.compact - Array.pack/String.unpack - Array.index & Array.rindex - Array.uniq - Enumerable.sort_by - Dir - Marshal

Would you be interested in a language that lacked these classes?